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In the penta­cyclic triterpenoide skeleton of the title mol­ecule, C 27 H 43 NO 2  [systematic name: (3 E ,3a S ,5a R ,5b R ,7a R ,11 R ,11a R ,11b R ,13a R ,13b R )-5a,5b,10,10,13b-penta­methyl­icosa­hydro-1 H -11,7a-(epoxy­methano)cyclo­penta­[ a ]chrysen-3-one oxime], the five-membered ring  A  has an envelope conformation, while the six-membered rings  B – E  adopt chair conformations. Rings  A  and  B  are  cis -fused. The hydroximino group has an  E  configuration. Strong inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into helical chains.

(E)-17β,19-Epoxymethano-17,23,24-tridemethyl-4-nor-5β,18α-olean-3-one oxime